(Hook.f. & Thomson) Al-Shehbaz & O’Kane
Description
Ianhedgea minutiflora is a diminutive, high-alpine crucifer with a broadly Irano-Turanian to western Himalayan distribution, recorded from Afghanistan, Pakistan, northern India, Tajikistan and Iran, and extending eastward into western Nepal. It is a plant of open, stony and gravelly ground, scree slopes, glacial moraines and dry alpine meadows at high elevations, typically between about 3,500 and 4,800 m. The collection from Baga-La-Phedi in West Nepal at 4,300 m in July reflects its occurrence in the cold, well-drained, sparsely vegetated terrain of the upper alpine zone, where the short summer growing season governs its rapid flowering.
The plant is a small annual or short-lived herb with slender, simple to branched stems arising from a thin taproot. The leaves are entire to slightly toothed, oblanceolate to spathulate and mostly basal. The inflorescence is a lax, ebracteate raceme bearing minute, inconspicuous flowers with four whitish petals scarcely exceeding the sepals, giving the species its epithet. The fruit is a small, linear, terete to slightly compressed silique that is sessile or shortly stipitate, dehiscing to release tiny seeds arranged in a single row per locule.
The genus Ianhedgea was segregated by Al-Shehbaz and O'Kane and named in honour of the cruciferologist Ian Charleson Hedge; the species was formerly placed in Sisymbrium and related genera, its basionym attributed to Hooker f. and Thomson. The transfer reflects molecular and morphological reassessment of the tribe Sisymbrieae. As an inconspicuous, widespread high-mountain annual, it faces no recognised conservation threat but is poorly documented owing to its small size and remote habitat.
Author: (Hook.f. & Thomson) Al-Shehbaz & O'Kane · Sources: POWO (Kew), Flora of Pakistan, Annotated Checklist of the Flowering Plants of Nepal, GBIF, Al-Shehbaz: Cruciferae systematics